Note 7 - Marketable Securities - Available-for-sale Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Marketable securities	$ 126,870	$ 132,695
Corporate Bonds [Member]
Available For Sale Securities Debt Maturities Within One Year Amortized Cost	49,434	27,690
Available-for-sale - matures within one year, Gross unrealized gains	45	4
Available-for-sale - matures within one year, Gross unrealized losses	(743)	(243)
Available-for-sale- matures within one year, Fair Value	48,736	27,451
Available-for-sale - matures after one year through five years, amortized cost	80,935	108,700
Available-for-sale - matures after one year through five years, Gross unrealized gains	127	278
Available for Sale Matures after One Year Through Five Years, Gross Unrealized Loss	(2,928)	(3,734)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value	78,134	105,244
Debt Securities, Available-for-Sale, Amortized Cost	130,369	136,390
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax	172	282
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(3,671)	(3,977)
Marketable securities	$ 126,870	$ 132,695

Available for sale matures after one year through five years gross unrealized gains.

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Available for sale matures after one year through five years gross unrealized loss.

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Available for sale matures within one year, gross unrealized gains.

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year through fifth year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

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